Actually, those Sprinter vehicles are just re-badged Mercedes vans. There's also a variant of that vehicle which has a "Freightliner" badge and slightly modified grill, but you can readily tell it's the Mercedes van. I guess Mercedes is multi-branching what with Smart Cars and all.

Yeah, Daimler owns Freightliner, and the Dodge brand is a holdover from Daimler-Chrysler days. I was mostly pointing out that, regardless of the branding, the Sprinter has been the standard ambulance vehicle in Europe for quite a few years now, so it wouldn't surprise me if one of the EMS companies also adopted the stereotypical European ambulance siren when they adopted the stereotypical European ambulance vehicle.

They only did that because Ford discontinued the diesel E-series chassis that most ambulances were built on. Heck, they're doing away with the E-series vans completely too, replacing with something that... looks like a Sprinter.